Shear Bond Strength of Orthodontic Stainless Steel Bracket in Bovine Teeth Submitted to Bleaching Agents

Resumo

The purpose of this in vitro study was to determine the influence of bleaching agents in the shear bond strength of orthodontic stainless steel bracket. The samples were composed by 90 bovine lower central incisors, which were divided into three groups named G1 (not submitted to bleaching), G2 (bleached with carbamide peroxide at 16%-Whiteness HP - FGM ®) and G3 (bleached with hydrogen peroxide at 35%-Whiteness HP, FGM ®). The teeth were stored in distilled water at a temperature of 37oC for 24 hours and 30 days was expected for the bonding of brackets Gemini 3M (3M - Unitek ®), after a wait period of 30 days the brackets were placed to all groups of samples, applied with the composite Transbond XT (3M/ESPE®). The shear bond test was performed in material testing machine EMIC DL 2000, carried under a deformation speed of 0.5 mm / min. The G1 presented an average strength of 6,05 (±3,47) MPa, while the G2 presented an average resistance of  2,52 (±1,69) MPa, and the G3 demonstrated 1,58 (±1,17) MPa. The results concluded that the dental bleaching induced, in the experimental model used, significant reduction of shear strength of brackets bonded to dental elements subjected to both in-home and in-clinic bleaching. These findings suggest that adherence of the resin used in the placement of the brackets was damaged by bleaching. Therefore, the most affected in the analysis of shear bond strength was first the in-clinic bleaching, followed by in-home bleaching and at last the control group and the greater the concentration of bleach is less shear strength. So it is suggested to perform the bleaching treatment after orthodontic treatment.

Referências

1. AJLOUNI, R.; BISHARA, S. E.; OONSOMBAT, C.; SOLIMAN, M.; LAFFOON, J. The effect of porcelain surface conditioning on bonding orthodontic brackets. Angle Orthodontist, v. 75, n. 5, p. 858-864, 2005.
2. BISHARA, S. E.; SOLIMAN, M.; OONSOMBAT, C.; AJLOUNI, R.; LAFFOON, J. F. The effect of variation in mesh-base design on the shear bond strength of orthodontic brackets. Angle Orthodontist, v. 74, n. 3, p. 400-404, 2004.
3. BISHARA, S. R.; OONSOMBAT, C.; SOLIMAN, M.; AJLOUNI, R.; LAFFOON, J. F. The effect of tooth bleaching on the shear bond strength of orthodontic brackets. American Journal of Orthodontics and Dentofacial Orthopedics, v. 128, n. 1, p. 755-760, 2005.
4. CACCIAFESTA, V.; SFONDRINI, M. F.; SCRIBANTE, A. B.; STIFANELLI, P. Effect of light tip distance on the shear bond strengths of composite. Angle Orthodontist, v. 75, n. 3, p. 386-391, 2005.
5. CACCIAFESTA, V.; SFONDRINI, M. F.; STIFANELLI, P.; SCRIBANTE, A. The effect of bleaching on shear bond strength of brackets bonded with a resin-modified glass ionomer. American Journal of Orthodontics and Dentofacial Orthopedics, v. 130, n. 1, p. 83-87, 2006.
6. COOZA, P.; MARTUCII, L.; TOFFOL, L. Shear bond strength of metal brackets on enamel. Angle Orthodontist, v. 76, n. 5, p. 851-856, 2006.
7. FARRET, M. M.; GONÇALVES, T. S.; LIMA, E. M. S.; MENEZES, L. M.; OSHIMA, H. M. S.; KOCHENBORGER, R.; FREITAS, M. P. M. Influência de variáveis metodológicas na resistência de união ao cisalhamento. Dental Press Journal of Orthodontics, v. 15, n. 1, p. 80-88, 2010.
8. GRONBERG, K.; ROSSOUW, E.; MILLER, B. H. Distance and time effect on shear bond strength of brackets cured with second-generation light-emitting diode unit. Angle Orthodontist, v. 65, n. 4, p. 682-688, 2006.
9. HAYWOOD, V. B.; HEYMANN, H. O. Nightguard vital bleaching. Quintessence International, v. 20, n. 3, p. 173-176, 1989.
10. MARTIN, J. M.; ALMEIDA, J. B.; ROSA, E. A.; SOARES, P.; TORNO, V.; RACHED, R. N. et al. Effect of fluoride therapies on the surface roughness of human enamel exposed to bleaching agents. Quintessence International, v. 41, n. 1, p. 71-78, 2010.
11. MCGUCKIN, R. S.; THURMOND, B. A.; OSOVITZ, S. Enamel shear bond strengths after vital bleaching. American Journal of Dentistry, v. 5, n. 4, p. 216-222, 1992.
12. MILES, P. G.; PONTIER, J. P.; BAHIRAIEI, D.; CLOSE, J. The effect of carbamide peroxide bleach on the tensile bond strength of ceramic brackets: an in vitro study. American Journal of Orthodontics and Dentofacial Orthopedics, v. 106, n. 4, p. 371-375, 1994.
13. MULLINS, J. M.; KAO, E. C.; MARTIN, C. A.; GUNEL, E.; NGAN, P. Tooth whitening effects on bracket bond strength in vivo. Angle Orthodontist, v. 79, n. 4, p. 777-783, 2008.
14. NAKAMICHI, I.; IWAKU, M.; FUSAYAMA, T. Bovine teeth as possible substitutes in the adhesion test. Journal of Dental Research, v. 62, n. 10, p. 1076-1081, 1998.
15. NORONHA, T. P. Influence of fluoride on public health and worker’s health – literature review. Revista Políticas Públicas & Cidades, v. 13, n. 2, e1267, 2024. DOI: 10.23900/2359-1552v13n2-288-2024.
16. PATUCSO, V. C.; MONTENEGRO, G.; LENZA, M. A.; CARVALHO, A. A. C. Bond strength of metallic brackets after dental bleaching. Angle Orthodontist, v. 79, n. 1, p. 122-126, 2007.
17. PINTO, C. F.; OLIVEIRA, R.; CAVALLI, V.; GIANNINI, M. Peroxide bleaching agent effects on enamel surface microhardness, roughness and morphology. Brazilian Oral Research, v. 18, n. 4, p. 306-311, 2004.
18. POLYDOROU, O.; WIRSCHING, M.; WOKEWITZ, M.; HAHN, P. Three-month evaluation of vital tooth bleaching using light units – a randomized clinical study. Operative Dentistry, v. 38, n. 1, p. 21-32, 2013.
19. PRIETSCH, J. R.; BROILO, J. R.; SPOHR, A. M. Influence of the dental bleaching with hydrogen peroxide in the orthodontic brackets bonding: in vitro study. Ortodontia Gaúcha, v. 7, n. 2, p. 136-144, 2003.
20. QUALTROUGH, A. J. E.; BURKE, F. J. T. A look at dental esthetics. Quintessence International, v. 25, n. 1, p. 7-14, 1994.
21. ROMANO, F.; TAVARES, S.; NOUER, D.; CONSANI, S.; MAGNANI, M. B. B. A. Shear bond strength of metallic orthodontic brackets bonded to enamel prepared with self-etching primer. Angle Orthodontist, v. 75, n. 5, p. 849-853, 2005.
22. SAMPAIO, R. S. C.; PACHECO, J. F. M. Colagem de acessórios ortodônticos metálicos sobre a porcelana através do uso de variados tempos de condicionamento com ácido fluorídrico e jateamento com óxido de alumínio. JBO – Jornal Brasileiro de Ortodontia e Ortopedia Facial, v. 6, n. 32, p. 109-117, 2001.
23. SATO, C.; RODRIGUES, F. A.; GARCIA, D. M.; VIDAL, C. M.; PASHLEY, D. H.; TJÄDERHANE, L.; CARRILHO, M. R.; NASCIMENTO, F. D.; TERSARIOL, I. L. Tooth bleaching increases dentinal protease activity. Journal of Dental Research, v. 92, n. 2, p. 187-192, 2013.
24. SFONDRINI, M. F.; CACCIAFESTA, V.; SCRIBANTE, A.; KLERSY, C. Plasma arc versus halogen light curing of orthodontic brackets: a 12-month clinical study of bond failures. American Journal of Orthodontics and Dentofacial Orthopedics, v. 125, n. 1, p. 342-347, 2004.
25. SMIDT, A.; WELLER, D.; ROMAN, I.; GEDALIA, I. Effect of bleaching agents on microhardness and surface morphology of tooth enamel. American Journal of Dentistry, v. 11, n. 2, p. 83-85, 1998.
26. SOUZA, M. A. L.; BERGAMISCHI, M. A. B.; SOUZA, F. L. Acid etching in bleached enamel. Jornal Brasileiro de Endodontia, v. 1, n. 1, p. 35-38, 1996.
27. TÜRKKAHRAMAN, H.; ADANIR, N.; GÜNGOR, Y. Bleaching and desensitizer application effects on shear bond strengths of orthodontic brackets. Angle Orthodontist, v. 77, n. 3, p. 489-493, 2007.
28. TÜRKÜN, M.; SEVGICAN, F.; PEHLIVAN, Y.; AKTENER, B. O. Effects of 10% carbamide peroxide on the enamel surface morphology: a scanning electron microscopy study. Journal of Esthetic and Restorative Dentistry, v. 14, n. 4, p. 238-244, 2002.
29. UYSAL, T.; BASCIFTCI, F. A.; USUMEZ, S.; SARI, Z.; BUYUKERKMEN, A. Can previously bleached teeth be bonded safely? American Journal of Orthodontics and Dentofacial Orthopedics, v. 123, n. 1, p. 628-632, 2003.
30. UYSAL, T.; SISMAN, A. Can previously bleached teeth be bonded safely using self-etching primer systems? Angle Orthodontist, v. 78, n. 4, p. 711-715, 2007.
31. VAN DER VYVER, P. J.; LEWIS, S. B.; MARAIS, J. T. The effect of bleaching agent on composite/enamel bonding. Journal of the Dental Association of South Africa, v. 52, n. 10, p. 601-603, 1997.